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Deposition Sciences Inc. - Difficult Coatings - LB - 8/23
Photonics Dictionary

group index

For a given mode propagating in a medium of refractive index n, the velocity of light in vacuum c, divided by the group velocity of the mode. For a plane wave of wavelength l, it is related to the refractive index as N = n ­ l(dn/dl).
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